/**
 ******************************************************************************
 * @file    c_test.c
 * @author  jobs
 * @version v0.00
 * @date    2020-02-27 10:30
 * @brief
 * @note
 *
 ******************************************************************************
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <inttypes.h>

#include <time.h>
#include <sys/time.h>
#include "queue.h"

typedef struct
{
	unsigned int init_value;
	unsigned int last_value;
	unsigned int result_value;
} CRC32_CTX;

struct file_list_q_s
{
	char path[1024];
	char name[512];
	char extension[16];
	uint64_t size;
	uint32_t cksum;
	uint8_t result;
	uint8_t reserved[3];
	QUEUE node;
};

typedef struct file_list_q_s file_list_q_t;

#define IDENTIFY_SIZE (15 * 15 * 4 * 1024)
#define PAGE_SIZE (4 * 1024)
uint64_t file_total_no = 0;

QUEUE file_list_q;

#define CRC32_INIT_VALUE (0xffffffff)
#define CRC32_XOR_VALUE (0xffffffff)

#define HASH_CNT (15)

/*
 * @brief polynomial 0x04C11DB7
 */
static const unsigned int CRC32Table[256] =
		{
				0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
				0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
				0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
				0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
				0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
				0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
				0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
				0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
				0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
				0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
				0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
				0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
				0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
				0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
				0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
				0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
				0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
				0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
				0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
				0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
				0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
				0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
				0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
				0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
				0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
				0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
				0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
				0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
				0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
				0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
				0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
				0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
				0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
				0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
				0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
				0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
				0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
				0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
				0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
				0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
				0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
				0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
				0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
				0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
				0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
				0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
				0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
				0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
				0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
				0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
				0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
				0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
				0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
				0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
				0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
				0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
				0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
				0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
				0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
				0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
				0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
				0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
				0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
				0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d};

const uint8_t hash_pos[HASH_CNT] = {0, 1, 2, 4, 5, 7, 8, 10, 11, 12, 16, 22, 23, 26, 32};

void crc32_init(CRC32_CTX *ctx)
{
	ctx->init_value = CRC32_INIT_VALUE;
	ctx->last_value = ctx->init_value;
}

void crc32_update(CRC32_CTX *ctx, unsigned char *buf, int length)
{
	unsigned int crc = ctx->last_value;
	while (length--)
	{
		crc = CRC32Table[(crc ^ (*buf++)) & 0xFF] ^ (crc >> 8);
	}
	ctx->last_value = crc;
}

void crc32_final(CRC32_CTX *ctx, unsigned char *buf, int length)
{
	crc32_update(ctx, buf, length);
	ctx->result_value = ctx->last_value ^ CRC32_XOR_VALUE;
}

unsigned int calc_crc32(unsigned char *buf, int length)
{
	CRC32_CTX ctx;
	crc32_init(&ctx);
	crc32_final(&ctx, buf, length);

	return (ctx.result_value);
}

int32_t proc_file(file_list_q_t *entry)
{
	//	printf("file[%s]\n", dir_path);
	int ret = 0;
	FILE *fp = NULL;
	char mbuf[IDENTIFY_SIZE];
	unsigned int file_id = 0;
	char file_path[1024] = {
			0,
	};
	int i, j;

	sprintf(file_path, "%s/%s", entry->path, entry->name);

	fp = fopen(file_path, "rb");
	if (fp == NULL)
	{
		printf("open file[%s] failed\n", file_path);
		ret = -2;
		goto proc_file_out;
	}
	fseek(fp, 0, SEEK_SET);
	fseek(fp, 0, SEEK_END);
	entry->size = ftell(fp);
	// printf("file[%s] size: %u\n", file_path, entry->size);
	memset(mbuf, 0, sizeof(mbuf));
	for (i = 0; i < HASH_CNT; ++i)
	{
		for (j = 0; j < HASH_CNT; ++j)
		{
			fseek(fp, hash_pos[i] * 1024 * 1024 + hash_pos[j] * PAGE_SIZE, SEEK_SET);
			ret = fread(mbuf + (i * HASH_CNT + j) * PAGE_SIZE, 1, PAGE_SIZE, fp);
			if (ret < PAGE_SIZE)
			{
				break;
			}
		}
	}
	fclose(fp);

proc_file_out:
	file_id = calc_crc32(mbuf, IDENTIFY_SIZE);
	// if (ret > 0)
	// {
	// }
	// else if (ret == 0)
	// {
	// 	file_id = 0;
	// }
	// else
	// {
	// 	file_id = 0xFFFFFFFF;
	// }

	entry->cksum = file_id;
	// for (i = 0; i < 1024; ++i)
	// {
	// }

	// if (ret > 0)
	// {
	// 	printf("%u,%u,%08X,%s,%s,%s\n", file_total_no, file_id, file_id, "OK", filename, filepath);
	// }
	// else if (ret == 0)
	// {
	// 	printf("%u,%u,%08X,%s,%s,%s\n", file_total_no, file_id, file_id, "NULL", filename, filepath);
	// }
	// else
	// {
	// 	printf("%u,%u,%08X,%s,%s,%s\n", file_total_no, file_id, file_id, "FAIL", filename, filepath);
	// }

	// file_total_no++;

	return (ret);
}

int insert_file_list(const char *filepath, const char *filename)
{
	file_list_q_t *file_list = NULL;
	file_list = (file_list_q_t *)malloc(sizeof(file_list_q_t));
	if (file_list == NULL)
	{
		printf("something failed\n");
		return (1);
	}

	sprintf(file_list->path, "%s", filepath);
	sprintf(file_list->name, "%s", filename);
	file_total_no++;
	file_list->cksum = 0;
	file_list->size = 0;
	file_list->result = 0;
	QUEUE_INIT(&file_list->node);
	QUEUE_INSERT_TAIL(&file_list_q, &file_list->node);
	return (0);
}

void proc_dir(const char *dir_path)
{
	int ret = 0;
	DIR *root_dir = NULL;
	DIR *next_dir = NULL;
	struct dirent *curr_dir = NULL;
	struct stat curr_stat;

	char *curr_path = NULL;

	root_dir = opendir(dir_path);
	if (root_dir == NULL)
	{
		printf("open dir[%s] failed\n", dir_path);
		return;
	}
	next_dir = root_dir;
	chdir(dir_path);
	curr_path = getcwd(NULL, 0);
	do
	{
		curr_dir = readdir(next_dir);
		if (curr_dir == NULL)
		{
			break;
		}

		memset(&curr_stat, 0, sizeof(struct stat));
		stat(curr_dir->d_name, &curr_stat);
		if (S_ISDIR(curr_stat.st_mode))
		{
			if ((strcmp(curr_dir->d_name, ".") == 0) || (strcmp(curr_dir->d_name, "..") == 0))
			{
				continue;
			}
			proc_dir(curr_dir->d_name);
		}
		else if (S_ISREG(curr_stat.st_mode))
		{
			// printf("%s/%s\n", curr_path, curr_dir->d_name);
			ret = insert_file_list(curr_path, curr_dir->d_name);
			if (ret != 0)
			{
				printf("something maybe wrong[%d]\n", ret);
			}
		}
	} while (1);
	chdir("..");
	closedir(root_dir);
	free(curr_path);
}

void display_cmd(const char *buf)
{
	static uint16_t buf_len = 0;
	uint16_t i = 0;
	// printf("\r");
	for (i = 0; i < buf_len; ++i)
	{
		printf("\b");
	}
	for (i = 0; i < buf_len; ++i)
	{
		printf(" ");
	}
	printf("\r");
	// printf("%c[2K", 27);
	printf("%s", buf);
	buf_len = strlen(buf);
}

void file_output(QUEUE *file_q, const char *file_out)
{
	QUEUE *q;
	file_list_q_t *file_entry = NULL;
	FILE *fp = NULL;
	char mbuf[1024 * 4];
	uint64_t cnt = 0;

	fp = fopen(file_out, "w+");
	if (fp == NULL)
	{
		perror("output file failed\n");
		return;
	}

	QUEUE_FOREACH(q, file_q)
	{
		file_entry = QUEUE_DATA(q, file_list_q_t, node);
		if (file_entry == NULL)
		{
			;
		}
		sprintf(mbuf, "%u,\"%u\",\"%08X\",%s,%u,%s\n", cnt, file_entry->cksum, file_entry->cksum, file_entry->name, file_entry->size, file_entry->path);
		fwrite(mbuf, strlen(mbuf), 1, fp);
		cnt++;
	}
	fclose(fp);
}

int main(int argc, char **argv)
{
	int ret = 0;
	uint32_t file_id = 0;
	int i = 0;
	char retbuf[32];
	char *cwp_path = NULL;
	char disp_buf[1024 * 4] = {
			0,
	};
	char outfile[1024] = {
			0,
	};
	uint64_t file_now_no = 0;
	file_list_q_t *file_list = NULL;
	QUEUE *q;

	QUEUE_INIT(&file_list_q);

	cwp_path = getcwd(NULL, 0);
	if (cwp_path == NULL)
	{
		printf("something wrong\n");
	}
	if (argc == 2)
	{
		if (strlen(argv[1]) > 0)
		{
			sprintf(outfile, "%s/%s", cwp_path, argv[1]);
		}
		else
		{
			sprintf(outfile, "%s/%s", cwp_path, "result.csv");
		}
	}
	else
	{
		sprintf(outfile, "%s/%s", cwp_path, "result.csv");
	}

	printf("cwp path[%s]\n", cwp_path);
	proc_dir(cwp_path);
	free(cwp_path);

	printf("total file: %u\n", file_total_no);
	printf("output file: %s\n", outfile);

	QUEUE_FOREACH(q, &file_list_q)
	{
		file_list = QUEUE_DATA(q, file_list_q_t, node);
		if (file_list == NULL)
		{
			;
		}
		proc_file(file_list);
		file_now_no++;
		sprintf(disp_buf, "process[%03d], [%08X], file[%s]", file_now_no * 100 / file_total_no, file_list->cksum,  file_list->name);
		display_cmd(disp_buf);
	}

	file_output(&file_list_q, outfile);
	return (0);
}
